EP0033903A1 - Fällmittel, Verfahren zu dessen Herstellung und dessen Verwendung zur Entphosphatisierung von Abwasser - Google Patents
Fällmittel, Verfahren zu dessen Herstellung und dessen Verwendung zur Entphosphatisierung von Abwasser Download PDFInfo
- Publication number
- EP0033903A1 EP0033903A1 EP81100614A EP81100614A EP0033903A1 EP 0033903 A1 EP0033903 A1 EP 0033903A1 EP 81100614 A EP81100614 A EP 81100614A EP 81100614 A EP81100614 A EP 81100614A EP 0033903 A1 EP0033903 A1 EP 0033903A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- iron
- weight
- sulfate
- precipitant
- iii
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Withdrawn
Links
- 239000002351 wastewater Substances 0.000 title claims abstract description 17
- 238000000034 method Methods 0.000 title claims abstract description 15
- 230000008569 process Effects 0.000 title claims abstract description 11
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 8
- NBIIXXVUZAFLBC-UHFFFAOYSA-K phosphate Chemical compound [O-]P([O-])([O-])=O NBIIXXVUZAFLBC-UHFFFAOYSA-K 0.000 claims abstract description 22
- RUTXIHLAWFEWGM-UHFFFAOYSA-H iron(3+) sulfate Chemical compound [Fe+3].[Fe+3].[O-]S([O-])(=O)=O.[O-]S([O-])(=O)=O.[O-]S([O-])(=O)=O RUTXIHLAWFEWGM-UHFFFAOYSA-H 0.000 claims abstract description 18
- 229910001868 water Inorganic materials 0.000 claims abstract description 16
- BAUYGSIQEAFULO-UHFFFAOYSA-L iron(2+) sulfate (anhydrous) Chemical compound [Fe+2].[O-]S([O-])(=O)=O BAUYGSIQEAFULO-UHFFFAOYSA-L 0.000 claims abstract description 15
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 15
- LIKBJVNGSGBSGK-UHFFFAOYSA-N iron(3+);oxygen(2-) Chemical compound [O-2].[O-2].[O-2].[Fe+3].[Fe+3] LIKBJVNGSGBSGK-UHFFFAOYSA-N 0.000 claims abstract description 13
- JEIPFZHSYJVQDO-UHFFFAOYSA-N iron(III) oxide Inorganic materials O=[Fe]O[Fe]=O JEIPFZHSYJVQDO-UHFFFAOYSA-N 0.000 claims abstract description 13
- CSNNHWWHGAXBCP-UHFFFAOYSA-L Magnesium sulfate Chemical compound [Mg+2].[O-][S+2]([O-])([O-])[O-] CSNNHWWHGAXBCP-UHFFFAOYSA-L 0.000 claims abstract description 12
- PIGJJOFBKFPZQG-UHFFFAOYSA-L hydrogen sulfate;iron(2+) Chemical compound [Fe+2].OS([O-])(=O)=O.OS([O-])(=O)=O PIGJJOFBKFPZQG-UHFFFAOYSA-L 0.000 claims abstract description 10
- 238000002156 mixing Methods 0.000 claims abstract description 9
- 238000010438 heat treatment Methods 0.000 claims abstract description 6
- 229910052943 magnesium sulfate Inorganic materials 0.000 claims abstract description 6
- 235000019341 magnesium sulphate Nutrition 0.000 claims abstract description 5
- 229910044991 metal oxide Inorganic materials 0.000 claims abstract description 4
- 150000004706 metal oxides Chemical class 0.000 claims abstract description 4
- 239000000203 mixture Substances 0.000 claims description 49
- 229910000360 iron(III) sulfate Inorganic materials 0.000 claims description 20
- 229910000359 iron(II) sulfate Inorganic materials 0.000 claims description 14
- 238000001556 precipitation Methods 0.000 claims description 14
- 150000003467 sulfuric acid derivatives Chemical class 0.000 claims description 11
- DIZPMCHEQGEION-UHFFFAOYSA-H aluminium sulfate (anhydrous) Chemical compound [Al+3].[Al+3].[O-]S([O-])(=O)=O.[O-]S([O-])(=O)=O.[O-]S([O-])(=O)=O DIZPMCHEQGEION-UHFFFAOYSA-H 0.000 claims description 7
- 239000007787 solid Substances 0.000 claims description 6
- 229910000349 titanium oxysulfate Inorganic materials 0.000 claims description 5
- 239000000126 substance Substances 0.000 claims description 4
- 229910052751 metal Inorganic materials 0.000 claims 2
- 239000002184 metal Substances 0.000 claims 2
- 239000000376 reactant Substances 0.000 claims 1
- QAOWNCQODCNURD-UHFFFAOYSA-L Sulfate Chemical compound [O-]S([O-])(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-L 0.000 abstract description 10
- 239000000084 colloidal system Substances 0.000 abstract description 7
- 230000001376 precipitating effect Effects 0.000 abstract description 3
- 230000036571 hydration Effects 0.000 abstract description 2
- 238000006703 hydration reaction Methods 0.000 abstract description 2
- 235000011128 aluminium sulphate Nutrition 0.000 abstract 1
- 239000001164 aluminium sulphate Substances 0.000 abstract 1
- 230000001112 coagulating effect Effects 0.000 abstract 1
- BUACSMWVFUNQET-UHFFFAOYSA-H dialuminum;trisulfate;hydrate Chemical compound O.[Al+3].[Al+3].[O-]S([O-])(=O)=O.[O-]S([O-])(=O)=O.[O-]S([O-])(=O)=O BUACSMWVFUNQET-UHFFFAOYSA-H 0.000 abstract 1
- 229910021653 sulphate ion Inorganic materials 0.000 abstract 1
- QAOWNCQODCNURD-UHFFFAOYSA-N Sulfuric acid Chemical compound OS(O)(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-N 0.000 description 22
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 21
- 239000010802 sludge Substances 0.000 description 19
- 229910019142 PO4 Inorganic materials 0.000 description 17
- 235000021317 phosphate Nutrition 0.000 description 17
- 238000006243 chemical reaction Methods 0.000 description 14
- 239000000047 product Substances 0.000 description 13
- 239000010452 phosphate Substances 0.000 description 12
- 229910052742 iron Inorganic materials 0.000 description 9
- UQSXHKLRYXJYBZ-UHFFFAOYSA-N iron oxide Inorganic materials [Fe]=O UQSXHKLRYXJYBZ-UHFFFAOYSA-N 0.000 description 9
- 239000000243 solution Substances 0.000 description 7
- 239000007795 chemical reaction product Substances 0.000 description 6
- 230000003647 oxidation Effects 0.000 description 6
- 238000007254 oxidation reaction Methods 0.000 description 6
- 150000003013 phosphoric acid derivatives Chemical class 0.000 description 5
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 description 4
- GWEVSGVZZGPLCZ-UHFFFAOYSA-N Titan oxide Chemical compound O=[Ti]=O GWEVSGVZZGPLCZ-UHFFFAOYSA-N 0.000 description 4
- 150000004677 hydrates Chemical class 0.000 description 4
- 239000011574 phosphorus Substances 0.000 description 4
- 229910052698 phosphorus Inorganic materials 0.000 description 4
- 150000003839 salts Chemical class 0.000 description 4
- 238000004062 sedimentation Methods 0.000 description 4
- 239000002253 acid Substances 0.000 description 3
- 229910052782 aluminium Inorganic materials 0.000 description 3
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 3
- AXCZMVOFGPJBDE-UHFFFAOYSA-L calcium dihydroxide Chemical compound [OH-].[OH-].[Ca+2] AXCZMVOFGPJBDE-UHFFFAOYSA-L 0.000 description 3
- 239000000920 calcium hydroxide Substances 0.000 description 3
- 229910001861 calcium hydroxide Inorganic materials 0.000 description 3
- 230000000052 comparative effect Effects 0.000 description 3
- 238000005189 flocculation Methods 0.000 description 3
- 230000016615 flocculation Effects 0.000 description 3
- 159000000014 iron salts Chemical class 0.000 description 3
- 239000011541 reaction mixture Substances 0.000 description 3
- 239000013049 sediment Substances 0.000 description 3
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 description 2
- VTLYFUHAOXGGBS-UHFFFAOYSA-N Fe3+ Chemical class [Fe+3] VTLYFUHAOXGGBS-UHFFFAOYSA-N 0.000 description 2
- 230000009471 action Effects 0.000 description 2
- AZDRQVAHHNSJOQ-UHFFFAOYSA-N alumane Chemical class [AlH3] AZDRQVAHHNSJOQ-UHFFFAOYSA-N 0.000 description 2
- 239000007864 aqueous solution Substances 0.000 description 2
- 230000015572 biosynthetic process Effects 0.000 description 2
- 239000000470 constituent Substances 0.000 description 2
- 230000008030 elimination Effects 0.000 description 2
- 238000003379 elimination reaction Methods 0.000 description 2
- 239000010841 municipal wastewater Substances 0.000 description 2
- 238000006386 neutralization reaction Methods 0.000 description 2
- TWNQGVIAIRXVLR-UHFFFAOYSA-N oxo(oxoalumanyloxy)alumane Chemical compound O=[Al]O[Al]=O TWNQGVIAIRXVLR-UHFFFAOYSA-N 0.000 description 2
- NDLPOXTZKUMGOV-UHFFFAOYSA-N oxo(oxoferriooxy)iron hydrate Chemical compound O.O=[Fe]O[Fe]=O NDLPOXTZKUMGOV-UHFFFAOYSA-N 0.000 description 2
- 239000002244 precipitate Substances 0.000 description 2
- 238000000926 separation method Methods 0.000 description 2
- 239000004408 titanium dioxide Substances 0.000 description 2
- 238000004131 Bayer process Methods 0.000 description 1
- 229910002588 FeOOH Inorganic materials 0.000 description 1
- PMZURENOXWZQFD-UHFFFAOYSA-L Sodium Sulfate Chemical compound [Na+].[Na+].[O-]S([O-])(=O)=O PMZURENOXWZQFD-UHFFFAOYSA-L 0.000 description 1
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 description 1
- 240000003834 Triticum spelta Species 0.000 description 1
- 150000007513 acids Chemical class 0.000 description 1
- 230000005791 algae growth Effects 0.000 description 1
- 239000003513 alkali Substances 0.000 description 1
- WNROFYMDJYEPJX-UHFFFAOYSA-K aluminium hydroxide Chemical compound [OH-].[OH-].[OH-].[Al+3] WNROFYMDJYEPJX-UHFFFAOYSA-K 0.000 description 1
- 239000007900 aqueous suspension Substances 0.000 description 1
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
- 239000002585 base Substances 0.000 description 1
- 230000008901 benefit Effects 0.000 description 1
- 159000000007 calcium salts Chemical class 0.000 description 1
- 239000001569 carbon dioxide Substances 0.000 description 1
- 229910002092 carbon dioxide Inorganic materials 0.000 description 1
- 150000001768 cations Chemical class 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 239000013078 crystal Substances 0.000 description 1
- 238000002425 crystallisation Methods 0.000 description 1
- 230000008025 crystallization Effects 0.000 description 1
- 238000000354 decomposition reaction Methods 0.000 description 1
- 230000018044 dehydration Effects 0.000 description 1
- 238000006297 dehydration reaction Methods 0.000 description 1
- 235000013325 dietary fiber Nutrition 0.000 description 1
- 238000010790 dilution Methods 0.000 description 1
- 239000012895 dilution Substances 0.000 description 1
- 239000003651 drinking water Substances 0.000 description 1
- 235000020188 drinking water Nutrition 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000012851 eutrophication Methods 0.000 description 1
- 238000001704 evaporation Methods 0.000 description 1
- 230000008020 evaporation Effects 0.000 description 1
- 239000000706 filtrate Substances 0.000 description 1
- 238000001914 filtration Methods 0.000 description 1
- 239000008187 granular material Substances 0.000 description 1
- 229910052739 hydrogen Inorganic materials 0.000 description 1
- QAOWNCQODCNURD-UHFFFAOYSA-M hydrogensulfate Chemical compound OS([O-])(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-M 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000002844 melting Methods 0.000 description 1
- 230000008018 melting Effects 0.000 description 1
- FWFGVMYFCODZRD-UHFFFAOYSA-N oxidanium;hydrogen sulfate Chemical class O.OS(O)(=O)=O FWFGVMYFCODZRD-UHFFFAOYSA-N 0.000 description 1
- 230000001590 oxidative effect Effects 0.000 description 1
- 229910052760 oxygen Inorganic materials 0.000 description 1
- 239000001301 oxygen Substances 0.000 description 1
- CHKVPAROMQMJNQ-UHFFFAOYSA-M potassium bisulfate Chemical compound [K+].OS([O-])(=O)=O CHKVPAROMQMJNQ-UHFFFAOYSA-M 0.000 description 1
- 229910000343 potassium bisulfate Inorganic materials 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 230000001681 protective effect Effects 0.000 description 1
- 238000000746 purification Methods 0.000 description 1
- 230000009257 reactivity Effects 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 239000011833 salt mixture Substances 0.000 description 1
- 239000010865 sewage Substances 0.000 description 1
- 229910052938 sodium sulfate Inorganic materials 0.000 description 1
- 235000011152 sodium sulphate Nutrition 0.000 description 1
- VBJGJHBYWREJQD-UHFFFAOYSA-M sodium;dihydrogen phosphate;dihydrate Chemical compound O.O.[Na+].OP(O)([O-])=O VBJGJHBYWREJQD-UHFFFAOYSA-M 0.000 description 1
- 229910052717 sulfur Inorganic materials 0.000 description 1
- 239000011593 sulfur Substances 0.000 description 1
- 239000000725 suspension Substances 0.000 description 1
- 239000008399 tap water Substances 0.000 description 1
- 235000020679 tap water Nutrition 0.000 description 1
- 238000007669 thermal treatment Methods 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
- 239000003643 water by type Substances 0.000 description 1
- 238000010626 work up procedure Methods 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/52—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities
- C02F1/5236—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities using inorganic agents
Definitions
- the present invention relates to a precipitant for the precipitation of phosphate ions and for the flocculation of colloids in wastewater as well as a method for producing the precipitant and its use.
- Wastewater especially municipal wastewater, contains a large part of dissolved phosphates, which lead to a strong increase in algae growth in standing or slow-flowing waters. By eliminating the dissolved phosphates, this eutrophication of the water can be prevented.
- the content of soluble phosphates in the municipal wastewater is usually in the range of the equivalent of 10 to 30 ppm of phosphorus.
- Such wastewater also contains organic colloids that can only be broken down to a small extent even with biological purification.
- phosphate removal using calcium hydroxide in the alkaline range at pH values above 9.5 is known from Klages, Meyer: GWF-Wasser, 116 (1975), pp. 370-372. It leads to low final concentrations of phosphate in the drain (below 1 ppm phosphorus), but also requires a subsequent neutralization of the wastewater, e.g. by introducing carbon dioxide.
- precipitates are obtained which are very difficult to settle and are also difficult to filter.
- the sedimented sludge must therefore be concentrated in a further stage and then usually deposited with a solids content of approx. 30%.
- the treatment of the sludge is therefore one of the most important economic factors when operating municipal sewage treatment plants.
- organic colloids by flocculation with aluminum or Can remove iron (III) salts from waste water. Such flocculation is common both in the treatment of drinking water and in the treatment of waste water.
- the solids content of the sludge formed plays an essential economic role in the process. From an economic point of view, a good precipitant or flocculant must on the one hand cause the sludge volume to be as low as possible, but on the other hand the sludge must also have a high solids content.
- iron (III) sulfate is produced from iron (III) oxide and sulfuric acid by adding a mixture of iron (III) oxide and the substoichiometric amount of sulfur. acid adds the missing amount of sulfuric acid in the form of oleum.
- the heat of dilution of the oleum serves as an energy source for the reaction. It is also necessary to pass an air stream through the reaction mixture so that the mass does not solidify into a hard block.
- the air flow is even preheated in order to be able to carry out the reaction to the end.
- separation of the iron (III) sulfate from the insoluble constituents is essential in order to obtain a usable precipitant. This process is very complex and has major corrosion problems.
- the red mud obtained in the production of aluminum oxide by the Bayer process is digested with a substoichiometric amount of sulfuric acid.
- the reaction product consists essentially of iron (III) -, aluminum sulfate and non-digested oxide residues as well as sodium sulfate.
- This process product which is relatively easy to produce, gives a precipitant which contains a considerable proportion of ineffective dietary fiber, including even soluble alkali sulfates.
- ferric oxide is reacted in aqueous suspension with a substoichiometric amount of sulfuric acid and the reaction product is then dried. Sulfuric acid is again applied to this dried material and the reaction of the sulfuric acid with the remaining iron oxide is continued with heating. Despite a reaction temperature from approx. 180 ° C only approx. 90% of the iron (III) oxide is converted to iron (III) sulfate. A complete reaction of iron (III) oxide with sulfuric acid is very difficult.
- the present invention therefore relates to a special precipitant comprising the following hydrated sulfates:
- Iron (II) sulfate 10 to 50% by weight, preferably 15 to 35% by weight, particularly preferably 20 to 33% by weight; Iron (III) sulfate, 16 to 50% by weight, preferably 18 to 40% by weight, particularly preferably 20 to 35% by weight; Aluminum sulfate, 2 to 15% by weight, preferably 3 to 12% by weight, particularly preferably 5 to 10% by weight; Magnesium sulfate, 0 to 10% by weight, preferably 3 to 10% by weight, particularly preferably 5 to 8% by weight; Titanyl sulfate, 0 to 10% by weight, preferably 3 to 10% by weight, particularly preferably 5 to 8% by weight; Water of hydration, 5 to 30% by weight, preferably 8 to 28% by weight, particularly preferably 12.5 to 25% by weight and optionally an excess of metal oxides in an amount of up to 25% by weight, based on the entire mix.
- the present invention furthermore relates to the use of the special precipitant with the composition specified above as a flocculant in water treatment and in the treatment of waste water.
- the present invention also relates to a process for producing this special precipitant and flocculant, which is characterized in that about 1 mol of iron (II) hydrogen sulfate, preferably the composition mixed with 0.6 to 1.0 mol of iron (III) oxide, which was not heated above 850 ° C during its production and the mixture is then heated to temperatures up to about 150 ° C.
- Technical iron products which, in addition to the compound FeS0 4 . H 2 SO 4 also contain other sulfates and water bound as water of crystallization.
- Technical waste products which preferably consist of Fe 2 O 3 or the oxide hydrates of trivalent iron and optionally contain iron (II) sulfate and / or iron (III) sulfate can be used as iron (III) oxide.
- Products from the roasting of technical iron (II) sulfate are particularly suitable, provided that the roasting has taken place at temperatures below 850 ° C. This is particularly well suited through the oxidative thermal treatment of FeSO 4 . 1 H 2 0 product obtained, which is often referred to in the literature as "basic iron (III) sulfate".
- the so-called filter salt which consists of approximately 50% by weight of iron (II) hydrogen sulfate, FeS0 4 . H 2 S0 4 exists, can be used in the context of the present invention as a component of the precipitant.
- a filtered sulfate mixture can have the following composition, for example:
- iron (II) hydrogen sulfate reacts with iron oxide or with the basic iron (III) sulfate, even in very small proportions, even when heat is applied externally.
- a typical hydrogen sulfate, potassium hydrogen sulfate practically does not react at all below its melting range with iron (III) oxide.
- an industrial iron hydrogen sulfate reacts with iron oxide, but only to the extent that it has not been heated above 850 ° C. or with basic iron (III) sulfate spontaneously during mixing.
- the reaction proceeds practically completely with approximately stoichiometric amounts of iron oxide or basic iron (IIIj sulfate) with heating.
- the reaction of the iron (II) hydrogen sulfate with the iron (III) oxide or the basic iron (III) sulfate can be accelerated if the reaction mixture is heated to 100 to 150 ° C. by external energy supply. Heating beyond this temperature range leads to partial dehydration of the sulfate hydrates and a reduction in the reactivity with dissolved phosphates.
- the particular advantage of this precipitant is the formation of a precipitated sludge with an unusually low sludge index, compared to the readily soluble salts of aluminum and trivalent iron that have been used as precipitants. Mixtures of readily soluble, hydrated salts, which correspond in their analytical composition to the precipitant produced according to the invention, surprisingly show a significantly higher sludge index than the precipitant.
- a mixing unit 100 kg of a sulfate mixture from the work-up of the thin acid from the titanium dioxide production were mixed with 12 kg of a roast product from the decomposition of iron (II) sulfate produced at 700 ° C. for 15 minutes.
- the sulfate mixture was an industrial iron (II) hydrogen sulfate with the following composition:
- the roasted product had the following composition:
- this re Action product is an effective precipitant for phosphate ions and a flocculant for organic colloids from aqueous solutions, for example from wastewater.
- a precipitant with the following composition was formed:
- the reaction product was a protective green, granular material with the following composition:
- the water is bound to the sulfates as crystal water. This reaction product was an effective precipitant.
- the end product has the following composition in both cases:
- the amount of sludge formed was calculated from the composition of the precipitant.
- the sludge volume index was calculated from this and from the read sludge volume.
- the sludge volume index was relatively easy to calculate even with small batches, if one calculated the precipitation product from the iron and aluminum salts for a 90% phosphate elimination and measured the sludge volume in a calibrated settling vessel.
- the precipitation product corresponds to the formula:
- the precipitated product from iron (II) sulfate corresponded to the formula given above for trivalent iron after the always occurring oxidation by the oxygen dissolved in the water.
Landscapes
- Chemical & Material Sciences (AREA)
- Inorganic Chemistry (AREA)
- Life Sciences & Earth Sciences (AREA)
- Hydrology & Water Resources (AREA)
- Engineering & Computer Science (AREA)
- Environmental & Geological Engineering (AREA)
- Water Supply & Treatment (AREA)
- Organic Chemistry (AREA)
- Separation Of Suspended Particles By Flocculating Agents (AREA)
- Removal Of Specific Substances (AREA)
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE3004825 | 1980-02-09 | ||
| DE19803004825 DE3004825A1 (de) | 1980-02-09 | 1980-02-09 | Faellmittel, verfahren zu dessen herstellung und dessen verwendung zur entphosphatisierung von abwasser |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| EP0033903A1 true EP0033903A1 (de) | 1981-08-19 |
Family
ID=6094186
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP81100614A Withdrawn EP0033903A1 (de) | 1980-02-09 | 1981-01-28 | Fällmittel, Verfahren zu dessen Herstellung und dessen Verwendung zur Entphosphatisierung von Abwasser |
Country Status (4)
| Country | Link |
|---|---|
| EP (1) | EP0033903A1 (ja) |
| JP (1) | JPS56126483A (ja) |
| BR (1) | BR8100744A (ja) |
| DE (1) | DE3004825A1 (ja) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0546850A1 (en) * | 1991-12-11 | 1993-06-16 | Tadahiko Kuno | Metallic sulfates as wastewater clarificant and their preparation |
| WO1998021148A1 (en) * | 1996-11-08 | 1998-05-22 | Tayca Corporation | Flocculant compositions and water treatment method using the same |
| CN114455665A (zh) * | 2022-01-25 | 2022-05-10 | 太原市润民环保节能有限公司 | 一种污水除磷药剂及其制备方法 |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS62277199A (ja) * | 1986-05-23 | 1987-12-02 | San:Kk | 汚泥疎水化剤 |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE124374C (ja) * | ||||
| AT143455B (de) * | 1932-05-07 | 1935-11-11 | Guggenheim Brothers | Verfahren zur Reinigung von Siel- und ähnlichen Abwässern. |
| CH227986A (de) * | 1941-02-14 | 1943-07-31 | Licentia Gmbh | Verfahren zum Reinigen von Abwasser. |
| DE2843053A1 (de) * | 1978-10-03 | 1980-04-24 | Bayer Ag | Faellmittel zur entphosphatisierung von abwasser und verfahren zu dessen herstellung |
-
1980
- 1980-02-09 DE DE19803004825 patent/DE3004825A1/de not_active Withdrawn
-
1981
- 1981-01-28 EP EP81100614A patent/EP0033903A1/de not_active Withdrawn
- 1981-02-06 JP JP1585381A patent/JPS56126483A/ja active Pending
- 1981-02-06 BR BR8100744A patent/BR8100744A/pt unknown
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE124374C (ja) * | ||||
| AT143455B (de) * | 1932-05-07 | 1935-11-11 | Guggenheim Brothers | Verfahren zur Reinigung von Siel- und ähnlichen Abwässern. |
| CH227986A (de) * | 1941-02-14 | 1943-07-31 | Licentia Gmbh | Verfahren zum Reinigen von Abwasser. |
| DE2843053A1 (de) * | 1978-10-03 | 1980-04-24 | Bayer Ag | Faellmittel zur entphosphatisierung von abwasser und verfahren zu dessen herstellung |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0546850A1 (en) * | 1991-12-11 | 1993-06-16 | Tadahiko Kuno | Metallic sulfates as wastewater clarificant and their preparation |
| WO1998021148A1 (en) * | 1996-11-08 | 1998-05-22 | Tayca Corporation | Flocculant compositions and water treatment method using the same |
| US6123854A (en) * | 1996-11-08 | 2000-09-26 | Hinomaru Kogyo Corporation | Flocculant compositions and water treatment method using the same |
| CN114455665A (zh) * | 2022-01-25 | 2022-05-10 | 太原市润民环保节能有限公司 | 一种污水除磷药剂及其制备方法 |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS56126483A (en) | 1981-10-03 |
| BR8100744A (pt) | 1981-08-18 |
| DE3004825A1 (de) | 1981-08-20 |
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